It is thought that a vertical alignment between these two stars checked with a plumb bob was used to ascertain where north lay.
12.
Before use, a theodolite must be precisely placed vertically above the point to be measured using a plumb bob, optical plummet or laser plummet.
13.
The accuracy of the instrument was limited by its size and by the effect the wind or observer's motion would have on the plumb bob.
14.
After a Mediterranean deployment in early 1966, the ship took part in " Plumb Bob II " and provided services for the David Taylor Model Basin.
15.
Tie a plumb bob to the bottom end of this line and tie the top end to a nail driven into the wall up near the ceiling.
16.
Note also that the length of the barge makes a difference to the speed of oscillations, just as the length of a plumb bob changes its speed.
17.
"At a course like Rockwood ( in Fort Worth ), you can plumb bob a putt, and the ball will go just like it plumbs, " he said.
18.
The article includes an illustration of his apparatus showing a hull form being subjected to a controlled heeling force with a plumb bob and scale to measure the inclination.
19.
A plumb bob, or plummet, is a weight, usually with a pointed tip on the bottom, suspended from a string and used as a vertical reference line, or plumb-line.
20.
If the condition was too windy for the plumb bobs to work effectively, the surveyor could pour water into the groove and measure the plane by checking the water level.
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